The Latest: Official: Shooter apparently felt disrespected

SAN FRANCISCO (AP) - The Latest on a deadly shooting at a San Francisco UPS warehouse (all times local):

12:30 p.m.

A San Francisco police department official says the UPS driver who shot and killed three colleagues appears to have felt disrespected by his co-workers.

Flowers are left at the UPS facility in San Francisco, Thursday, June 15, 2017. Officials say UPS employee Jimmy Lam shot and killed three fellow UPS drivers Wednesday before fatally shooting himself in the head in front of police officers. (AP Photo/Paul Elias)

The official could not provide details and cautioned it's one of several possible motives for Wednesday's shooting by 38-year-old Jimmy Lam during a meeting of fellow UPS drivers at a San Francisco UPS warehouse. The official spoke Friday on condition of anonymity because the investigation is ongoing and the department is not discussing the case publicly.

Shaun Vu, a senior UPS driver, has said Lam also struggled with personal issues and was depressed a few years ago. He had shown improvement, but Vu said Lam looked troubled a few weeks ago. That was around the time Lam filed a grievance over his work hours.

The official says Lam appears to have targeted the three drivers he fatally shot. It's not clear those drivers had anything to do with his feeling of being disrespected.

Lam killed himself as officers approached.

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11:30 a.m.

A UPS driver who witnessed a deadly shooting at the company's San Francisco warehouse says drivers at the facility generally got along and didn't mind working there.

Leopold Parker said Friday that the man accused of the shooting, fellow driver Jimmy Lam, sometimes complained about the workload. But Parker says he never suspected Lam would turn violent.

The 53-year-old Parker says he was standing by his truck for a morning meeting of drivers Wednesday when Lam walked up and shot driver Benson Louie in the head. Louie was a few feet in front of Parker. Parker said Lam glanced at him, but went the opposite way after shooting Louie.

Parker jumped into the cab of his truck. He ran to the roof of the building after he saw Lam running toward an exit.

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1 a.m.

Jimmy Lam had his troubles: a drunk driving conviction, a grievance against his company, a struggle with personal issues and depression a few years ago.

But colleagues and investigators say none of it helps explain why the UPS driver showed up at his San Francisco workplace Wednesday and gunned down three colleagues, wounding two others.

DMV records show he was convicted twice of driving on a suspended license in 2013 and 2014. His license was also suspended in 2014 for negligently operating a vehicle.

The 38-year-old Lam also had a run-in with the law in 2010, when he was convicted in San Francisco of driving under the influence and sentenced to three years' probation.

There was no indication that Lam's driving record affected his ability to work at UPS.

In this Sept., 2016, photo provided by Abbie Chin, Benson Louie, middle, stands with volleyball teammates and a trophy at the NACIVT Tournament in Toronto, Canada, in September 2012. 50-year-old Louie was killed Wednesday, June 14, 2017, in San Francisco, Calif., with two other UPS drivers. From left are Henry Lam, Shaun Vu, Louie, Ed Chan and Robert Lew. (Abbie Chin via AP)

In this Sept., 2016, photo provided by Abbie Chin, Benson Louie holds a trophy after his volleyball team wins the North American Chinese Invitational Volleyball Tournament in Los Angeles, Calif. 50-year-old Louie was killed Wednesday, June 14, 2017, in San Francisco, Calif., with two other UPS drivers. (Abbie Chin via AP)

San Francisco police in the foreground and UPS workers in the background stand outside a UPS package delivery warehouse where a shooting took place Wednesday, June 14, 2017, in San Francisco. A UPS spokesman says four people were injured in the shooting at the facility and that the shooter was an employee. (AP Photo/Eric Risberg)

UPS workers gather outside after a reported shooting at a UPS warehouse and customer service center in San Francisco on Wednesday, June 14, 2017. San Francisco police confirmed a shooting at the facility in the Potrero Hill neighborhood but didn't release information on injuries or the shooter. (AP Photo/Eric Risberg)